Telephone receiver with detachable sound amplifier



' 1,636,362 July 19, 1927. E A GRAHAM TELEPHONE nscsxvsn WITH DETACHABLE souun AMPLIFIER Filed Feb. 12, 1926 Inventor 5mm Wm Patented July 19, 1927.

UNITED STATES EDWARD ALFRED GRAHAM, OF BROCKLEY, LONDON, ENGLAND; MARIA GRAHAM AND ALFRED GRAHAM EXECUTORS OF SAID EDWARD ALFRED CEASED.

GRAHAM, DE-

TELEPHONE RECEIVER WITH DETACHABLE SOUND AMPLIFIER.

Application filed February 12, 1926, Serial No. 87,899, and in Great Britain September 11, 1925.

This invention relates to means of the kind in which a sound amplifier surmounts a hol low base, pedestal or plinth containing a wireless telephonic receiver, and it has for its object to provide for the better and $1111- pler connection together of the said parts, the .receiver being so constructed or constltuted that, if desired, it can readily be attached, after removal from the base, pedestal or plinth (hereinafter referred to as the base), to another sound amplifier, say the tone arm or sound conduit of a gramophone for example.

To this end, the face of the telephonic receiver which abuts against the inner or lower side of the top wall of the base is formed or provided with an externally screw thread ed member or stem adapted to pass through an opening in the top wall of the base and to project well above such top wall so that it can enter a companion internally screw threaded and non-sonorous bushing ortion of a horn or trumpet of any suita le description (hereinafter referred to as the horn) which bears on the top of the base. In this way, the horn is directly made use of to clamp the top wall of the base directly between it and the telephonic receiver, the act of unscrewing the horn serving to release the parts without it being necessary to manipulate any auxiliary fastening device.

The internally screw threaded bushing with which the narrower end of the horn is equipped may be made of rubber or like vibration-deadening or non-sonorous material.

The accompanying illustrative drawing shows partly in side elevation and partly in vertical section, a combined sound amplifier, hollow base and telephonic receiver connected together according to the invention.

a is a hollow base, 72 a sound amplifier'in the form of an upwardly extending horn having its smaller lower end fitted with an internally screw threaded bushing b of rubher and bearing on the top wall a of the base a, and c a telephonic receiver having an upwardly extending externally screw threaded tubular member or stem 0 that extends through a hole a in the top wall a of the base a and is firmly enga ed with the internally screw threaded bushing b in the lower end of the horn b. In this way the top be found especially suitable for connection,

after removal from the horn b and base a to any alternative sound amplifying con duit, such for instance, as the tone arm of say a gramophone, a more or less flexible member being employed to effect the connection and taking the place of the screw threaded bushing N.

The horn: b may be made in twoparts,

adaptedto be screwed together with an interposed ring 7:: of rubber or like material.

'What I claim is 1. Sound amplifying means embodying a telephonic receiver, comprising a hollow base, a telephonic receiver having an externally screw threaded hollow stem extending through a hole in the top wall of said base and extending above said wall and a horn having its smaller inlet end fitted with a bushing of vibration deadening or non-sonorous material formed wit-h an internal screw threaded companion to the external screw thread on the stem of the telephonic receiver and firmly engaged with such stem whereby the top wall of the base is firmly clamped between the upper end of the receiver and the smaller end of the horn in a readily detachable manner.

'2. Sound amplifying means embodying a telephonic receiver, comprising a, hollow base having a flat top, wall, a telephonic receiver. having at one end an externally screw threaded hollow stem extending through a hole in said top wall and extending above the same and a born, the smaller inlet end of which is fitted with an internally screw threaded bushing of india rubber, firmly engaged with said screw threaded stem and gearing directly against the top wall of said ase.

Signed at London, England, this eleventh day of January, 1926. Y

EDWARD ALFRED GRAHAM. 

